Convert core components to async-def coroutine syntax (#1658)

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/web_server_base/__init__.py

@@ -19,9 +19,9 @@ CONFIG_SCHEMA = cv.Schema(
 
 
 @coroutine_with_priority(65.0)
-def to_code(config):
+async def to_code(config):
     var = cg.new_Pvariable(config[CONF_ID])
-    yield cg.register_component(var, config)
+    await cg.register_component(var, config)
 
     if CORE.is_esp32:
         cg.add_library("FS", None)